Honolulu vs capital of Hawaii

Honolulu and capital of Hawaii both are nouns.

Word	Noun	Adjective	Verb	Adverb
Honolulu	Yes	No	No	No
capital of Hawaii	Yes	No	No	No

As nouns, Honolulu and capital of Hawaii are synonyms defined as:

Honolulu and capital of Hawaii: the capital and largest city of Hawaii; located on a large bay on the island of Oahu

Other synonyms of Honolulu include Hawaiian capital.

Honolulu (noun)	capital of Hawaii (noun)
the capital and largest city of Hawaii; located on a large bay on the island of Oahu	the capital and largest city of Hawaii; located on a large bay on the island of Oahu